uid=MCM,o=EDI,dc=edirepository,dc=org all public read GLAC_CHEM_SNOW Anna Bergstrom annabergstrom@boisestate.edu https://orcid.org/0000-0002-9684-4018 Michael Gooseff michael.gooseff@colorado.edu http://goosefflab.weebly.com https://orcid.org/0000-0003-4322-8315 McMurdo Dry Valleys LTER http://mcmlter.org/ Kathleen Welch kathleen.welch@colorado.edu https://orcid.org/0000-0003-1028-3086 lab technician Marci Beitch Marci.Beitch.Contractor@usap.gov field crew Renée Brown rfbrown@unm.edu https://orcid.org/0000-0002-4986-7663 data manager 2021-06-03 English

This data package contains chemical characteristics of snow in the ablation zone of Canada Glacier, located in Taylor Valley, McMurdo Dry Valleys, Antarctica during the 2016-17 austral summer. Specifically, snow samples were collected from the ablation zones of Canada and Commonwealth Glaciers to characterize the chemistry of recent snowfall in the ablation zones of these glaciers. Samples were collected in triplicate near mass balance stakes on the same date ice cores were collected as part of a larger study characterizing the spatial and temporal geochemical evolution of glacial meltwater. A subset of snow samples collected from Canada Glacier have been analyzed and are included here. This package may be amended in the future if analysis of the remaining samples from both Canada and Commonwealth Glaciers occurs.

biogeochemistry calcium chemical properties chemistry chloride inorganic nitrogen magnesium nitrate nitrogen potassium snow sodium sulfate water chemistry LTER Controlled Vocabulary Antarctica chemistry glacier inorganic nitrogen LTER McMurdo Dry Valleys nitrate nitrogen snow Taylor Valley Station Keywords inorganic nutrients LTER Core Areas Funding for these data was provided by the National Science Foundation Grant #OPP-1637708 for Long Term Ecological Research.

This data package is released under the Creative Commons Attribution 4.0 International License (CC BY 4.0; http://creativecommons.org/licenses/by/4.0/), which allows consumers (hereinafter referred to as “Data Users”) to freely reuse, redistribute, transform, or build on this work (even commercially) so long as appropriate credit is provided. Accordingly, Data Users are required to properly cite this data package in any publications or in the metadata of any derived products that result from its use (in whole or in part). A recommended citation is provided on the summary metadata page associated with this data package in the McMurdo Dry Valleys LTER Data Catalog (https://mcmlter.org/data), and a generic citation may be found on the summary metadata page in the repository where this data package was obtained. When these data contribute significantly to the contents of a publication, Data Users must also acknowledge that data were provided by the NSF-supported McMurdo Dry Valleys Long Term Ecological Research program (OPP-2224760). This data package has been released in the spirit of open scientific collaboration. Hence, Data Users are strongly encouraged to consider consultation, collaboration, and/or co-authorship (as appropriate) with the data package creator(s). Data Users should be aware these data may be actively used by others for ongoing research; thus, coordination may be necessary to prevent duplicate publication. Data Users should also recognize that misinterpretation of data may occur if they are used outside the context of the original study. Hence, Data Users are urged to contact the data package creator(s) if they have any questions regarding methodology or results. While substantial efforts are made to ensure the accuracy of this data package (with all its components), complete accuracy cannot be guaranteed. Periodic updates to this data package may occur, and it is the responsibility of Data Users to check for new versions. This data package is made available “as is” and comes with no warranty of accuracy or fitness for use. The creator(s) of this data package and the repository where these data were obtained shall not be liable for any damages resulting from misinterpretation, use, or misuse of these data. Finally, as a professional courtesy, we kindly request Data Users notify the primary contact referenced in the metadata when these data are used in the production of any derivative work or publication. Notification should include an explanation of how the data were used, along with a digital copy of the derived product(s). Thank you.

https://mcm.lternet.edu/content/chemical-characteristics-snow-ablation-zone-canada-glacier-mcmurdo-dry-valleys-antarctica The Canada Glacier a small glacier flowing south-east into the northern side of Taylor Valley.  The glacier receives less than 10 cm of snowfall annually. Its seasonal melting feeds Lake Hoare to the west and Lake Fryxell to the east. 162.894287109375 163.057708740234 -77.598403930664 -77.632133483887 2016-11-28 McMurdo Dry Valleys LTER Information Manager im@mcmlter.org McMurdo Dry Valleys LTER http://mcmlter.org/ McMurdo Dry Valleys LTER

Snow collection occurred at five locations (2 on Canada Glacier and 3 on Commonwealth Glacier) co-located with ice cores and seasonal mass balance measurement locations (ablation stakes). However, this package only includes data from the subset of samples that have been analyzed. Snow samples were collected within several meters of ice core collections (these data are in an accompanying data package) and mass balance stakes. Samples were collected using a clean scoop and gloved hands and placed in a clean whirlpack. Upon collection, samples were placed in a cooler that was transported back to a field camp and stored at -20º C. Samples were later transported to the Crary Lab at McMurdo Station where they were melted and poured into a triple DI-washed polyethylene bottle and refrozen. Samples were then shipped back to Boulder, Colorado and stored at -20º C.The samples collected from Canada Glacier on 28 November 2016 were thawed at 4º C and analyzed by atomic absorption spectroscopy for Ca2+, Mg2+, K+, and Na+, and by ion chromatography (IC) for Cl-, NO3-, and SO4-.While the remaining samples have not yet been processed, additional notes regarding sample collection are provided here for reference. 28 November 2016, Canada Glacier: Snow was collected from snowfall that began on 21 November 2016. Total accumulation was approximately 6 inches. Some snow melt was observed on the glacier at the time of sampling, particularly in more sloped locations. Samples were collected integrating the entire depth of snow, approximately 3 inches. 6 December 2016, Canada Glacier: Additional snow samples were collected at the #52 and #54 ablation stakes (same as on 28 November 2016). Snow was crusty and had been redistributed as a result of a Foehn wind event that had occurred on 1 December 2016. More sediment was visible in the snow. 12 December 2016, Canada Glacier: Snow was collected from the #52 and #54 ablation stakes in depressions that had collected/maintained wind-blown snow. 13 December 2016, Commonwealth Glacier: Snow was collected from the #5, #6 and #10 ablation stakes. There was approximately 2 inches of snow on top of ice at the time of collection.

GLAC_CHEM_SNOW mcmlter-glac-bergstrom-chem-snow-20210601.csv 745 1 column , " https://mcm.lternet.edu/sites/default/files/data/mcmlter-glac-bergstrom-chem-snow-20210601.csv DATASET_CODE Dataset code Internal dataset code. string Internal dataset code. GLACIER Glacier Name of the glacier where the snow sample was collected. string Name of the glacier where the snow sample was collected. SAMPLE_DATE Sample date Date of sample collection (GMT +13). date MM/DD/YY Latitude Latitude Latitude of sample collection (GCS WGS1984) in decimal degrees. decimalDegrees real LONGITUDE Longitude Longitude of sample collection (GCS WGS1984) in decimal degrees. decimalDegrees real STAKE_ID Stake ID Ablation stake number adjacent to sample collection location. string Ablation stake number adjacent to sample collection location. REPLICATE Replicate Letter identifying snow sample replicate at each sampling location. string Letter identifying snow sample replicate at each sampling location. CL_MG_L Chloride concentration Chloride concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real N-NO3_MG_L Nitrogen (as nitrate) concentration Nitrogen (N-NO3) concentration in the sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real BLANK missing SO4_MG_L Sulfate concentration Sulfate concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real CA_MG_L Calcium concentration Calcium concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real MG_MG_L Magnesium concentration Magnesium concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real K_MG_L Potassium concentration Potassium concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real NA_MG_L Sodium concentration Sodium concentration in the snow sample. Value of -100 is below detection limit, while -9999 indicates an unanalyzed sample and/or missing value. milligramsPerLiter real